8921967728 has 40 divisors (see below), whose sum is σ = 17820250800. Its totient is φ = 4325266944.

The previous prime is 8921967713. The next prime is 8921967749. The reversal of 8921967728 is 8277691298.

It is a Harshad number since it is a multiple of its sum of digits (59).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4178 + ... + 133646.

It is an arithmetic number, because the mean of its divisors is an integer number (445506270).

Almost surely, 2^8921967728 is an apocalyptic number.

It is an amenable number.

8921967728 is a deficient number, since it is larger than the sum of its proper divisors (8898283072).

8921967728 is a wasteful number, since it uses less digits than its factorization.

8921967728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129609 (or 129603 counting only the distinct ones).

The product of its digits is 6096384, while the sum is 59.

The square root of 8921967728 is about 94456.1682898475. The cubic root of 8921967728 is about 2074.0547475139.

The spelling of 8921967728 in words is "eight billion, nine hundred twenty-one million, nine hundred sixty-seven thousand, seven hundred twenty-eight".